Abstract: There is disclosed an electrode structure for an electrochemical cell comprising a fibrous support made of organic polymeric material, which is 0.1 to 3 mm. thick, carrying a pattern of solid conductors extending over the surface of the porous support from a current take off region to regions spaced therefrom, and containing electrochemically active material deposited on the fibrous support, in contact with the conductors, in an amount of at least 0.1 grams/sq. cm/mm thickness in such a manner that electrical energy produced by the electrochemical reaction can be conducted out of the electrode. Also disclosed are methods and apparatus for making the structure.